how do i seal an external wooden and security door to stop bugs getting through?

i have a wooden door and a security door on the front and back of my house. i find that bug seem to get through the wooden door when closed making the wife scream and be afraid. so ideally i need to seal the security door between the door and the frame somehow to prevent bugs getting in around it.
I have one of them brush seals on the bottom but they seem to crawl in around the sides, is there any way i can seal the sides of the door with an airtight seal of some sort to prevent bugs getting through the sides of the doors?


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